A rechargeable zinc-air battery based on zinc peroxide chemistry

Rechargeable alkaline zinc-air batteries promise high energy density and safety but suffer from the sluggish 4 electron (e )/oxygen (O ) chemistry that requires participation of water and from the electrochemical irreversibility originating from parasitic reactions caused by caustic electrolytes and...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2021-01, Vol.371 (6524), p.46-51
Hauptverfasser: Sun, Wei, Wang, Fei, Zhang, Bao, Zhang, Mengyi, Küpers, Verena, Ji, Xiao, Theile, Claudia, Bieker, Peter, Xu, Kang, Wang, Chunsheng, Winter, Martin
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Sprache:eng
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Zusammenfassung:Rechargeable alkaline zinc-air batteries promise high energy density and safety but suffer from the sluggish 4 electron (e )/oxygen (O ) chemistry that requires participation of water and from the electrochemical irreversibility originating from parasitic reactions caused by caustic electrolytes and atmospheric carbon dioxide. Here, we report a zinc-O /zinc peroxide (ZnO ) chemistry that proceeds through a 2e /O process in nonalkaline aqueous electrolytes, which enables highly reversible redox reactions in zinc-air batteries. This ZnO chemistry was made possible by a water-poor and zinc ion (Zn )-rich inner Helmholtz layer on the air cathode caused by the hydrophobic trifluoromethanesulfonate anions. The nonalkaline zinc-air battery thus constructed not only tolerates stable operations in ambient air but also exhibits substantially better reversibility than its alkaline counterpart.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abb9554